Carpenter Ant Exterminator Services
Fast, eco-conscious carpenter ant control that stops colonies from hollowing out the wood in your home or business. Backed by our satisfaction guarantee.
- Thorough Inspection & Nest Location
- Safer, Targeted Colony Treatment
- Long-Term Prevention Solutions
What Are Carpenter Ants?
Carpenter ants are among the largest ants found in Ontario and one of the few species that can damage a building’s structure. Unlike termites, they don’t eat wood. They chew through it to build nests, leaving smooth tunnels and piles of sawdust-like debris behind. They prefer wood that’s been softened by moisture, so leaks around roofs, windows, decks, and plumbing often draw them in. Because a colony can take years to mature and may spread into several satellite nests, damage often builds quietly before anyone notices. That’s why carpenter ants call for more targeted treatment than other species covered by our ant control services.
How to Identify Carpenter Ants
| Colour | Size | Legs | Antennae | Shape | Region |
|---|---|---|---|---|---|
| Black, sometimes red and black | 1/4–1/2″ long (queens up to 3/4″) | 6 | Yes, elbowed | Segmented, narrow waist | Found throughout Canada |
The black carpenter ant is the most common species in Ontario. Look for a large, dark body, an evenly rounded back when viewed from the side, a single node between the thorax and abdomen, and bent, elbowed antennae. In spring, winged carpenter ants are often mistaken for termites, but ants have a pinched waist and front wings that are longer than their back wings.
Signs You Have a Carpenter Ant Problem
- Small piles of coarse, sawdust-like shavings (frass) under baseboards, window sills, or door frames
- Large black ants indoors, especially at night when carpenter ants are most active
- Winged ants emerging inside in spring, which often signals a mature nest within the structure
- Faint rustling or crackling sounds inside walls, hollow doors, or ceilings
- Wood that sounds hollow when tapped, or has small slit-like openings on the surface
- Ant trails running between your home and nearby trees, stumps, or woodpiles
- Discarded wings collected near windows, vents, or baseboards
Keeping Carpenter Ants Out of Your Home
- Repair roof, plumbing, and window leaks promptly, since moisture-softened wood is where carpenter ants prefer to nest.
- Replace water-damaged or rotting wood in decks, fascia boards, sills, and door frames.
- Trim tree branches and shrubs so they don’t touch the roof or siding, as ants use them as bridges into the home.
- Store firewood at least 20 feet away from the house and raised off the ground.
- Remove old stumps, dead trees, and wood debris close to the home.
- Seal cracks and gaps around the foundation, windows, doors, and where utilities and pipes enter the home.
- Keep gutters clear and make sure downspouts direct water away from the foundation.
- Keep attics, basements, and crawl spaces well ventilated and dry.
- Store food and pet food in airtight containers and clean up sugary spills and crumbs quickly.
- Keep wood mulch pulled back a few inches from the foundation.
Health & Property Risks of Carpenter Ants
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Structural Damage
Carpenter ants tunnel through framing, sill plates, joists, and window frames, and a long-established colony can weaken the wood it nests in
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Hidden, Slow-Building Damage
Nests inside walls, insulation, and hollow doors often go unnoticed until a colony is well established
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Satellite Colonies
A parent colony outdoors can support several satellite nests inside a home, so treating only the ants you see rarely solves the problem
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Moisture Warning Sign
Carpenter ant activity often points to a hidden leak or rot that needs attention on its own
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Painful Bites
Carpenter ants aren't known to spread disease, but they can deliver a painful bite when disturbed and can contaminate food while foraging
Our Carpenter Ant Removal Process
Step 1. Consultation and Inspection
A licensed technician inspects your property inside and out to locate nests, frass piles, moisture-damaged wood, and active ant trails.
Step 2. Full-Site Inspection Report
You'll get a clear summary of what we found: nest locations, satellite colonies, damaged areas, and the moisture conditions drawing ants in.
Step 3. Custom Pest Control Action Plan
We build a targeted treatment plan around baiting, direct nest treatment, and exclusion, tailored to where the colony is living and how it's getting in.
Step 4. Putting Your Plan Into Action
We treat nests and satellite colonies at the source and address the entry points and conditions that attracted them.
Step 5. Guidance on Staying Pest-Free
We confirm activity has stopped and provide you with a list of steps you can take, including moisture repairs, to prevent re-infestation.
Why Choose GreenLeaf?
Eco-Friendly
Methods
Science-based treatments with proven, maximal effectiveness and minimal impact that are safer for your family, pets, and the environment.
100% Satisfaction Guarantee
Your peace of mind is our priority. We back our work with a 100% satisfaction guarantee.
Trusted Since
1999
We're a team of licensed, experienced technicians proudly serving homeowners and businesses across the GTA and Southern Ontario since 1999.
Customized Treatment Plans
We identify current and potential infestations based on your property's characteristics and location to design a treatment plan that keeps you protected.
The GreenLeaf Pest Control Home Protection Plan
For businesses and homeowners dealing with persistent or recurring pest issues, our Home Protection Plan (HPP) offers a long-term solution. It begins with an intensive first visit to resolve any immediate infestations, followed by scheduled inspections and responsive service calls throughout the year, anytime pests reappear.
Learn More About Our Home Protection Plan
What Our Customers Say
Get Help With Carpenter Ants Today
Finding sawdust piles under your window sills or large black ants in the kitchen? Contact GreenLeaf today for a free estimate and fast, safer carpenter ant control.
Frequently Asked Carpenter Ant Control Questions
What will an exterminator do for carpenter ants?
A carpenter ant exterminator starts with a full inspection to find the nest, any satellite colonies, and the moisture problems drawing ants in. From there, a licensed technician applies targeted baits and treatments directly to nests, wall voids, and entry points, rather than spraying living spaces. They’ll also recommend repairs, like fixing leaks or replacing damaged wood, and follow up to confirm the colony is gone. GreenLeaf’s licensed technicians have handled carpenter ant control across Toronto, the GTA, and Southern Ontario since 1999.
How do you permanently get rid of carpenter ants?
Permanent control means eliminating the whole colony, including satellite nests, and removing the conditions that attracted it. That includes fixing leaks, replacing moisture-damaged wood, clearing stumps and woodpiles near the house, and sealing entry points. Ongoing inspections through a program like our Home Protection Plan catch new activity early, and every job is backed by the GreenLeaf 100% Satisfaction Guarantee. If activity returns after treatment, we’ll come back at no additional cost.
Should I squish carpenter ants?
Squishing a carpenter ant won’t cause harm, but it won’t solve the problem either. The ants you see are foragers from a colony that can number in the thousands, often hidden inside walls or wood. Store-bought repellent sprays can also scatter the colony and make the nest harder to find. If you’re seeing carpenter ants indoors regularly, a professional inspection to locate and treat the nest is the more effective route.
What can be mistaken for a carpenter ant?
Winged termites are the most common look-alike, especially during spring swarms. Carpenter ants have a pinched waist, bent antennae, and front wings longer than their back wings, while termites have a thick waist, straight antennae, and equal-length wings. Other large dark ants, like field ants, are also often confused with carpenter ants. Field ants nest in soil rather than wood and don’t damage structures.
What time of year are carpenter ants most active?
In Ontario, carpenter ants are most active from spring through summer, with winged swarmers usually appearing in spring. They forage mostly at night. If you see carpenter ants inside during late winter or early spring, before outdoor colonies are active, it’s a strong sign the nest is inside your home.
What is the hardest ant to get rid of?
Carpenter ants and pharaoh ants are widely considered two of the hardest ants to eliminate. Carpenter ants are difficult because their nests are hidden inside wood and wall voids, and one parent colony can support several satellite nests. Pharaoh ants can split into new colonies when disturbed by the wrong treatment. In both cases, targeted professional treatment works better than DIY sprays.
What are the signs of carpenter ants, and what does their damage look like?
Common signs include small piles of sawdust-like shavings (frass) near baseboards or window sills, large black ants indoors at night, winged ants in spring, and faint rustling inside walls. The damage itself looks like smooth, clean tunnels carved into the wood, almost as if it’s been sanded. Affected wood may sound hollow when tapped or have small slit-like openings on the surface. Severe, long-term damage can weaken framing, window frames, and other structural wood.
Where do carpenter ants nest?
Carpenter ants usually build their main colony outdoors in dead trees, stumps, logs, or landscaping timbers, then create satellite nests inside homes. Indoors, they favour damp or damaged wood around windows, door frames, roof lines, bathrooms, and under sinks, as well as wall voids, hollow doors, and foam insulation. Any area with a past or ongoing leak is a likely nesting spot.
How much does carpenter ant removal cost?
Cost depends on the size of the infestation, how many nests and satellite colonies are present, and how accessible they are. A single nest caught early costs less to resolve than a mature colony spread across several areas of a home. We provide a free, no-obligation estimate after an inspection so you know the cost upfront.
Do you guarantee your carpenter ant control service?
Yes. Every job is backed by the GreenLeaf 100% Satisfaction Guarantee. Our licensed technicians have been serving homes and businesses since 1999, and if carpenter ant activity returns after treatment, we’ll come back and address it at no additional cost.
Do you offer carpenter ant control near me?
We provide residential and commercial carpenter ant control across Toronto, the GTA, and Southern Ontario. Check the areas we serve below, or contact us for a free estimate, and we’ll confirm service availability for your property.
